Asymmetric alkyl BTBT LC semiconductor possessing fluorine substituted pheny group, 2-dodecyl -7-(3,4-difluoro-phenyl)-[1]benzothieno[3,2-b][1]benzothiophene (2FPh-BTBT-C12) was studied on charge carrier mobility by time-of-flight (TOF) method correlated to the mesomorphism. 2FPh-BTBT-C12 exhibits highly ordered smectic mesophases with the temperature range from 175 °C to 264 °C. The introduction of 3,4-difluorophenyl group on BTBT core part leads a wide mesophase temperature range.
